Just asking out of pure curiosity here as a non-Pinoy outsider from another SE Asian country.
From my online interaction with Filipinos and from knowing some in real life, I noticed that Philos hardly talk about or show rather little interest in their precolonial culture and history before the arrival of the Spaniards and Americans. Instead, it looks like most are more interested and passionate about the history and culture during Spanish and American periods of colonialism and influence than the ancient kingdoms and city-states like Tondo, Maynila, Butuan, etc. that came before that.
Why is that? Why aren't there more research into the precolonial era of Philippines and various aspects of it such as artifacts, ancient ruins or their lifestyle?